5 pencils and 7 pens together cost Rs 50, whereas 7 pencils and 5 pens together cost Rs 46. Find the cost of one pencil and pen graphically.
Answers
Answered by
34
let rupees of pencil and pens be x and y
5x +7y = 50. (1). ×5
7x +5y = 46. (2) ×7
25x +35y =250
49x +35y =322
- - -
-24x=-72
24x=72
x=72/24
x=3
put in (1)
5×3+7y=50
15+7y=50
7y=35
y=35/7
y=5
cost of one pencil=3
cost of one pen=5
5x +7y = 50. (1). ×5
7x +5y = 46. (2) ×7
25x +35y =250
49x +35y =322
- - -
-24x=-72
24x=72
x=72/24
x=3
put in (1)
5×3+7y=50
15+7y=50
7y=35
y=35/7
y=5
cost of one pencil=3
cost of one pen=5
Answered by
0
Answer:
cost of 1pencil is 3 and cost of 2pen is 5
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